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Frequency Lock Loop

Discussion in 'General Electronics Discussion' started by abforce, Nov 14, 2013.

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  1. abforce

    abforce

    2
    0
    Nov 14, 2013
    Hi everyone:

    I'm looking for some solution to build a frequency lock loop for my application. I have two sinusoidal signals, one is at 40Mhz and the other is 60Mhz. I want to achieve an output which can switch between the frequencies between these two signals while still remain the phase information.

    I find some frequency-to-voltage-converters but none of them can work at such high frequency. PLL is good if in some way I can keep the phase difference as it is.

    Thank you for any suggestion!
     
  2. duke37

    duke37

    5,364
    772
    Jan 9, 2011
    What about generating 20MHz, then doubling to 40MHz and tripling to 60MHz?
    Switching at the correct point in the 20MHz wave will let the output change smoothly.
     
  3. abforce

    abforce

    2
    0
    Nov 14, 2013
    Thank you for your reply! I produced the signals with VCO for the moment. The point is that I want a third signal to follow these two signals while not losing its own phase characteristic.
     
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